Scattering-lens based quantum imaging beyond shot noise

TL;DR

This paper proposes a quantum imaging scheme using squeezed states with scattering lenses to surpass shot-noise limitations, achieving higher resolution and signal-to-noise ratio than classical methods.

Contribution

It introduces a novel quantum imaging approach employing squeezed states to reduce quantum noise below shot-noise level, enhancing resolution and SNR.

Findings

Enhanced signal-to-noise ratio with squeezed states

Improved imaging resolution beyond classical limits

Theoretical demonstration of noise suppression below shot noise

Abstract

The scheme of optical imaging using scattering lens can provide a resolution beyond the classical optical diffraction limit with a coherent-state input. Nevertheless, due to the shot noise of the coherent state, the corresponding signal-to-noise ratio and resolution are both still shot-noise-limited. In order to circumvent this problem, we theoretically propose an alternative scheme where the squeezed state (with a sub-shot noise) is considered as input and the quantum noise is then suppressed below the shot-noise level. Consequently, when comparing with the previous imaging scheme (using combination of coherent state and scattering lens), our proposal is able to achieve an enhanced signal-to-noise ratio for a given scattering lens. Meanwhile, it is demonstrated that the resolution is also improved. We believe that this method may afford a new way of using squeezed states and enable a higher performance than that of using coherent state and scattering lens.